Pressure on the cellphone industry to introduce technology that could disable stolen smartphones has intensified with the introduction of proposed federal legislation that would mandate such a system.

Senate bill 2032, “The Smartphone Prevention Act,” was introduced to the U.S. Senate Wednesday by Amy Klobuchar, a Minnesota Democrat. The bill promises technology that allows consumers to remotely wipe personal data from their smartphones and render them inoperable.

But how that will be accomplished is currently unclear. The full text of the bill was not immediately available and the offices of Klobuchar and the bill’s co-sponsors were all shut down Thursday due to snow in Washington, D.C.

The co-sponsors are Democrats Barbara Mikulski of Maryland, Richard Blumenthal of Connecticut and Mazie Hirono of Hawaii.

Theft of smartphones is becoming an increasing problem in U.S. cities, and the crimes often involve physical violence or intimidation with guns or knives.

In San Francisco, two-thirds of street theft involves a smartphone or tablet and the number is even higher in nearby Oakland. It also represents a majority of street robberies in New York and is rising in Los Angeles.

In some cases, victims have been killed for their phones.

In response to calls last year by law-enforcement officials to do more to combat the crimes, most cellphone carriers have aligned themselves behind the CTIA, the industry’s powerful lobbying group. The CTIA is opposing any legislation that would introduce such technology.

An outlier is Verizon, which says that while it thinks legislation is unnecessary, it is supporting the group behind the California bill.

Some phone makers have been a little more proactive.

Apple in particular has been praised for the introduction of its activation lock feature in iOS 7. The function would satisfy the requirements of the proposed California law with one exception: Phones will have to come with the function enabled by default so consumers have to make a conscious choice to switch it off. Currently, it comes as disabled by default.

Samsung has also added features to some of its phones that support the Lojack software, but the service requires an ongoing subscription.

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